Do Cockroaches Like Light or Dark?
HESHAM MAHMOUD
HESHAM MAHMOUD
11 November 2026

Do cockroaches like light or dark? Cockroaches prefer the dark. They are nocturnal insects that come out to feed once the house is quiet and hide by day. When you switch on the light and see them run, they are fleeing movement and danger more than the light itself. Leaving the light on does not stop them; they get used to it when food is there.

Why do cockroaches come out at night?

  • It is safer: less movement and fewer threats.
  • Humidity is higher at night, which they need.
  • Food is exposed: dinner leftovers, dishes and rubbish.
  • Their eyes are sensitive and work well in dim light.

Does leaving the light on keep cockroaches away?

  • No. It may delay them a little at first.
  • Then they adapt and come out with the light on.
  • Seeing them with the light on means numbers are high and hiding places are full.

Are some cockroaches attracted to light?

Yes, some species:

  • The American cockroach (large): may fly towards light on hot nights.
  • Flying males of some species are drawn to outdoor lights.
  • The German cockroach (small): avoids light and prefers tight, dark cracks.

What does seeing cockroaches in daytime mean?

It is a sign of heavy infestation:

  • Hiding places no longer hold the numbers.
  • The young and weak are pushed out of shelter.
  • There are usually many times more hidden than you saw.

Where do cockroaches hide by day?

  • Behind and under the fridge and oven.
  • Under the sink and around pipes.
  • Inside cupboard hinges and corners.
  • Inside appliances: microwave, kettle, router.
  • Drains and manholes.

How to use this

  1. Inspect at night: enter the kitchen two hours after lights out and see where they come from.
  2. Place gel near the shelters you saw them leave, not in the middle of the floor.
  3. Place glue boards in dark corners to find where numbers are highest.
  4. Do not rely on light; rely on bait and cleanliness.

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FAQs

Do cockroaches like the cold?

No. They prefer warmth and humidity. See Do Cockroaches Disappear in Winter?

Do cockroaches like sugar?

Yes, and they also eat fats, starches and any food scraps.

Does a cockroach come to phone or TV light?

Usually not. What draws it towards you is food and warmth, not the screen.

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